Types of internal structure and external morphology of submarine dunes under the influence of tide- and wind-driven processes (Dover Strait, northern France)

Bot, Sophie Le; Trentesaux, Alain

doi:10.1016/j.margeo.2004.07.002

Cited by 62 publications

(55 citation statements)

References 19 publications

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“…However, the interplay of oceanic currents, such as a Mediterranean-water outflow, increasing the effects of ebb currents cannot be discarded. Additional factors, such as interaction between wind and tidal currents, which can lead to changes in the sediment transport direction, might also have played a role in controlling the cross-bedding distribution, as recognised in some present-day tidal settings (Pattiaratchi and Collins, 1984;Harris, 1989;Le Bot and Trentesaux, 2004), but their importance is difficult to discern in this fossil example.…”

Section: Genesis and Significance Of The Giant Cross-beddingmentioning

confidence: 95%

“…In modern environments, the asymmetry of the cross-bedding distribution seems to be related with the different velocities of tidal flood and ebb currents at a given depth (Kranck, 1972;Bartholdy et al, 2002;Le Bot and Trentesaux, 2004;van der Vegt et al, 2009). According to this, ebb currents dominated the North-Betic Strait, generating the largest, west-orientated cross-bedding.…”

Section: Genesis and Significance Of The Giant Cross-beddingmentioning

confidence: 99%

See 1 more Smart Citation

History and evolution of the North-Betic Strait (Prebetic Zone, Betic Cordillera): A narrow, early Tortonian, tidal-dominated, Atlantic–Mediterranean marine passage

Martín

Braga

Aguirre

et al. 2009

Sedimentary Geology

126

108

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Section: Genesis and Significance Of The Giant Cross-beddingmentioning

confidence: 95%

Section: Genesis and Significance Of The Giant Cross-beddingmentioning

confidence: 99%

History and evolution of the North-Betic Strait (Prebetic Zone, Betic Cordillera): A narrow, early Tortonian, tidal-dominated, Atlantic–Mediterranean marine passage

Martín

Braga

Aguirre

et al. 2009

Sedimentary Geology

126

108

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“…3C). As with the giant tidal dunes in Dover Strait (Le Bot and Trentesaux, 2004), these fl at surfaces are interpreted to be the result of extreme storms. It is possible to correlate, at the scale of the bank area, fi ve main progradational sets.…”

Section: Present-day Barriermentioning

confidence: 96%

Impacts of late Holocene rapid climate changes as recorded in a macrotidal coastal setting (Mont-Saint-Michel Bay, France)

Billeaud¹,

Tessier²,

Lesueur³

2009

Geology

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International audienceThe impacts of rapid climate changes during the Holocene are well documented in deep oceanic and lacustrine sediments. Until now, no studies have shown the effects of rapid climate change on tidal successions in coastal wedges formed during the late Holocene transgression. Cores and very high resolution seismic data collected in Mont-Saint-Michel Bay, France, a macrotidal setting, demonstrate that rapid climate changes, with ~1500 year periodicity, are recorded in the sedimentary successions that constitute the late Holocene infill of the bay. The sedimentary expressions of rapid climate changes vary according to the different subenvironments within Mont-Saint-Michel Bay; cycles, a few meters thick, can be correlated throughout the bay, and radiocarbon dating suggests that they have a millennial time scale. The various changes reflect an increase in wave dynamics in association with Bond cold events, possibly in conjunction with long-term (1800 year periodicity) tidal cycle

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“…3). These unit boundaries can be considered to be major bounding boundaries or first-order discontinuities within the ridge by comparison to previous works on eolian dunes (Brookfield, 1977), tidal sand dunes (Berné et al, 1988(Berné et al, , 1989(Berné et al, , 1993Ferret et al, 2010;Le Bot and Trentesaux, 2004), and sand ridges (Marsset et al, 1999;Trentesaux et al, 1999). The corresponding reflectors are labelled on the seismic lines (R B1 to R B4 ) and mark the respective upper limits of the seismic units U B1 to U B4 .…”

Section: Seismicmentioning

confidence: 95%

Long term evolution and internal architecture of a high-energy banner ridge from seismic survey of Banc du Four (Western Brittany, France)

et al. 2015

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International audienceThe recent completion of a coupled seismic and swath bathymetric survey, conducted across the sand ridge system of the Banc du Four located on the Atlantic continental shelf of Brittany (Mer d’Iroise, France), provided new data for the study of the long term evolution of deep tidal sand ridges. Five seismic units are distinguished within the ridge, separated by pronounced major bounding surfaces. The basal unit is interpreted to be shoreface deposits forming the core of the ridge. It is overlaid by a succession of marine sand dunes fields forming the upper units. Sandwave climbing, which combines progradation and accretion, is the major process controlling the growth of the ridge. The elevation of the preserved dune foresets reaches values of about 20–30 m within the ridge. The foresets indicate a combination of giant dunes characterized by numerous steep (up to 20°) clinoforms corresponding to a high-energy depositional environment. Moreover, the presence of scour pits linked to the 3D geometries of giant dunes allow the growth of bedforms migrating oblique to the orientation of giant dune crest lines. All of the radiocarbon ages of the biogenic surficial deposits of the Banc du Four range from 10,036 to 2748 cal years B.P. and suggest the Banc du Four has grown during the last sea-level rise. The apparent absence of recent surface deposits could be caused by a change in benthic biogenic productivity or the non-conservation of recent deposits. In contrast, the presence of relatively old sands at the top of the ridge could be explained by the reworking and leakage of the lower units that outcrop locally at the seabed across the ridge. Moreover, the long-term evolution of the ridge appears strongly controlled by the morphology of the igneous basement. The multiphase accretion of the ridge is closely linked to the presence of a residual tidal current eddy, consecutive with the progressive flooding of the coastal promontories and straits that structured the igneous basement.Therefore, the Banc du Four should be thought of as a representative example of a large-scale high-energy banner bank

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Types of internal structure and external morphology of submarine dunes under the influence of tide- and wind-driven processes (Dover Strait, northern France)

Cited by 62 publications

References 19 publications

History and evolution of the North-Betic Strait (Prebetic Zone, Betic Cordillera): A narrow, early Tortonian, tidal-dominated, Atlantic–Mediterranean marine passage

History and evolution of the North-Betic Strait (Prebetic Zone, Betic Cordillera): A narrow, early Tortonian, tidal-dominated, Atlantic–Mediterranean marine passage

Impacts of late Holocene rapid climate changes as recorded in a macrotidal coastal setting (Mont-Saint-Michel Bay, France)

Long term evolution and internal architecture of a high-energy banner ridge from seismic survey of Banc du Four (Western Brittany, France)

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